Merge branch 'master' into devel-sigmac

rules/linux/lnx_susp_failed_logons_single_source.yml

@@ -8,7 +8,7 @@ detection:
         log: auth
         pam_user: not null
         pam_rhost: not null
-    timeframe: last 24h 
+    timeframe: 24h 
     condition: selection | count(pam_user) by pam_rhost > 3
 falsepositives:
     - Terminal servers

rules/linux/modsecurity/modsec_mulitple_blocks.yml

@@ -0,0 +1,17 @@
+title: Multiple Modsecurity Blocks
+description: Detects multiple blocks by the mod_security module (Web Application Firewall) 
+logsource:
+    product: linux
+    service: modsecurity
+detection:
+    selection:
+        - 'mod_security: Access denied'
+        - 'ModSecurity: Access denied'
+        - 'mod_security-message: Access denied'
+    timeframe: 120m 
+    condition: selection | count() > 6
+falsepositives:
+    - Vulnerability scanners
+    - Frequent attacks if system faces Internet
+level: medium
+

rules/network/net_susp_network_scan.yml

@@ -7,8 +7,12 @@ detection:
     selection:
         log: network
         action: denied
-    timeframe: last 24h
+    timeframe: 24h
     condition:
         - selection | count(dst_port) > 10 by src_ip
         - selection | count(dst_ip) > 10 by src_ip
-level: medium
+falsepositives:
+    - Inventarization systems
+    - Vulnerability scans
+    - Penetration testing activity
+level: medium

rules/web/web_apache_segfault.yml

@@ -0,0 +1,14 @@
+title: Apache Segmentation Fault
+description: Detects a segmentation fault error message caused by a creashing apacke worker process 
+author: Florian Roth
+reference: http://www.securityfocus.com/infocus/1633
+logsource:
+    product: apache
+detection:
+    keywords:
+        - 'exit signal Segmentation Fault'
+    condition: keywords
+falsepositives:
+    - Unknown
+level: high
+

rules/windows/builtin/win_alert_mimikatz_keywords.yml

@@ -22,5 +22,5 @@ detection:
     condition: selection and 1 of keywords
 falsepositives:
     - Naughty administrators
-    - Penetraion test
+    - Penetration test
 level: critical

rules/windows/builtin/win_susp_failed_logons_single_source.yml

@@ -12,7 +12,7 @@ detection:
             - 4776
         UserName: not null
         SourceWorkstation: not null
-    timeframe: last 24h 
+    timeframe: 24h 
     condition: selection | count(UserName) by SourceWorkstation > 3
 falsepositives:
     - Terminal servers

rules/windows/sysmon/sysmon_susp_mmc_source.yml

@@ -1,4 +1,4 @@
-title: Proceses created by MMC 
+title: Processes created by MMC 
 status: experimental
 description: Processes started by MMC could by a sign of lateral movement using MMC application COM object 
 reference: https://enigma0x3.net/2017/01/05/lateral-movement-using-the-mmc20-application-com-object/